From: Hank Leung (hank1979@xxxxxxxxxxx)
Date: Wed Jun 14 2000 - 16:41:13 GMT-3
Joe,
Sorry to imply anything. My fault, bad sentence structure. I've used this
configuration before and it worked fine. I originally learned this from
"Cisco Packetized Voice & Data Integration" by Robert Caputo, page 71. He
uses the same access-list and says that it identifies TCP/UDP port numbers
used by voice over IP. Sorry I couldn't be anymore help.
Good luck.
Hank.
>From: Joe Pinkus <jpinkus@cisco.com>
>Reply-To: Joe Pinkus <jpinkus@cisco.com>
>To: Hank Leung <hank1979@hotmail.com>
>CC: ccielab@groupstudy.com
>Subject: Re: Lazy VoIP question
>Date: Wed, 14 Jun 2000 14:28:21 -0400
>
>Hank,
>
>I don't know where you are getting your information. Look at the ITU specs
>for
>H.323.
>
>H.225 will use TCP port 1720 as well as a port in the range of 11xxx
>H.245 uses TCP ports 11xxx
>RTP is a random choice of ports in the range of 16xxx to 32xxx, the port
>number
>choosen is not dependent on the number of conversations, it is a complete
>random
>choice negotiated between the two endpoints.
>
>Also, I have never had a class taught by you, so please don't imply this in
>your
>email.
>
>Thanks,
>Joe
>
>Hank Leung wrote:
>
> > Hey Joe,
> > H.323 uses RAS H.225 for packetization and synchronization, it also uses
> > H.245 to control communications between DTEs. But the TCP port H.323
>uses
> > is TCP 1720. I have a link:
> >
> > http://www.cs.columbia.edu/~hgs/rtp/h323.html
> >
> > You're right about the RTP UDP ports, though. The ENTIRE voice port
>range
> > is(16384-32767). RTP begins on an even number and RTCP follows on the
>next
> > odd number, and so on. I remembered the access-list I gave you from a
>class
> > I taught recently. I guess my range of 16380-16480 works because of our
>low
> > number of conversations.
> >
> > Best!
> > Hank
> >
> > >I am not sure how this access list would work. H.225 and H.245 will
>use
> > >TCP
> > >ports 11xxx during the call signaling and setup. RTP will use UDP
>ports
> > >16384 to 32767.
> > >
> > >Joe
> > >
> > >Hank Leung wrote:
> > >
> > > > Yup. I use these in my configs. Should catch everything.
> > > >
> > > > access-list 101 permit udp any any range 16380 16480
> > > > access-list 101 permit tcp any any eq 1720
> > > >
> > > > Hank
> > > > CCNP-Voice
> > > >
> > > > >From: Jeff Sapiro <jsapiro@wnmail.wndev.att.com>
> > > > >Reply-To: Jeff Sapiro <jsapiro@wnmail.wndev.att.com>
> > > > >To: GroupStudy CCIE <ccielab@groupstudy.com>
> > > > >Subject: Lazy VoIP question
> > > > >Date: Mon, 12 Jun 2000 13:01:48 -0400
> > > > >
> > > > >Does VoIP require tcp/udp ports? I can't find info on this. Which
> > >ports
> > > > >(for firewall considerations)?
> > > > >-Jeff
> > > > >
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